5 Interface Specifications

 

 

 

Command

OP Code

Description

READ BUFFER

3Ch

Copies the tape drive’s microcode across the SCSI

 

 

bus to the initiator. Used in conjunction with the

 

 

WRITE BUFFER command.

 

 

 

READ POSITION

34h

Reports the tape drive’s current logical position but

 

 

does not cause tape motion to occur. Used in

 

 

conjunction with the LOCATE command.

 

 

 

RECEIVE DIAGNOSTIC

1Ch

Reports the results of the tests requested by a

RESULTS

 

previous SEND DIAGNOSTIC command or to obtain a

 

 

trace of SCSI and servo command activity for the tape

 

 

drive.

 

 

 

RELEASE UNIT

17h

Releases a tape drive from an initiator’s exclusive use,

 

 

or if third-party reservations are in effect, from another

 

 

SCSI device’s use. Used in conjunction with the

 

 

RESERVE UNIT command.

 

 

 

REQUEST SENSE

03h

Requests that the tape drive transfer sense data to the

 

 

initiator.

 

 

 

RESERVE UNIT

16h

Reserves the tape drive for an initiator’s exclusive use,

 

 

or if third-party reservations are in effect, for another

 

 

SCSI device’s use. Used in conjunction with the

 

 

RELEASE UNIT command.

 

 

 

REWIND

01h

Causes the tape drive to rewind the tape to the logical

 

 

beginning of tape.

 

 

 

SEND DIAGNOSTICS

1Dh

Causes the tape drive to perform certain

 

 

self-diagnostic tests.

 

 

 

SPACE

11h

Enables the tape drive to perform forward or backward

 

 

searches.

 

 

 

TEST UNIT READY

00h

Allows you to determine if the tape drive is ready to

 

 

accept an appropriate medium access command.

 

 

 

VERIFY

13h

Enables the tape drive to verify one or more logical

 

 

blocks of data on the tape.

 

 

 

WRITE

0Ah

Transfers one or more bytes or blocks of data from the

 

 

initiator to the tape drive.

 

 

 

WRITE BUFFER

3Bh

Allows you to load new microcode from the SCSI bus

 

 

into the tape drive’s control memories. Used in

 

 

conjunction with the READ BUFFER command.

 

 

 

WRITE FILEMARKS

10h

Causes the tape drive to write zero, one, or more

 

 

filemarks or setmarks (8500c format) to tape.

 

 

 

May 1994

EXB-8205 and EXB-8505

5-5

 

(Standard and XL)

 

Page 89
Image 89
Exabyte EXB-8505 8mm manual Receive Diagnostic